Homopolar radial magnetic suspension bearing, compressor and air conditioner

Abstract

The invention provides a homopolar radial magnetic suspension bearing, a compressor and an air conditioner. The homopolar radial magnetic suspension bearing comprises a stator core, a rotor and radial magnetic conductive rings, the stator core comprises a yoke part and stator teeth, radial control windings are arranged on part of the stator teeth, mounting grooves are formed in part of the stator teeth, permanent magnets are mounted in the mounting grooves, and the radial control windings and the stator teeth are alternately arranged in the circumferential direction. Magnetic isolation grooves are formed at the radial outer sides of the permanent magnets, a bias magnetic field generated by the permanent magnets forms a bias magnetic loop through the yoke part, the stator teeth and the rotor, and a control magnetic field generated by the radial control windings forms a control magnetic loop through the stator teeth, the rotor and the radial magnetic conductive rings. According to the homopolar radial magnetic suspension bearing, the bearing structure can be simplified, the power consumption can be reduced, and the bearing reliability can be improved.

Description

technical field [0001] The present application relates to the technical field of magnetic suspension, in particular to a homopolar radial magnetic suspension bearing, a compressor and an air conditioner. Background technique [0002] Magnetic suspension bearing is a new type of high-performance bearing that uses the magnetic force between the stator and the rotor to suspend the rotor in space, so that there is no contact between the stator and the rotor. The rotor of the magnetic suspension bearing can reach a very high speed, and has the advantages of small mechanical wear, low energy consumption, long life, no lubrication, no pollution, etc., especially suitable for special applications such as high speed, vacuum and ultra-clean. [0003] At present, the structure forms of permanent magnet bias radial magnetic bearings researched internationally are divided into heteropolar and homopolar structures. The axial length of heteropolar structures can be made shorter, but hyster...

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Problems solved by technology

[0003] At present, the structure forms of permanent magnet bias radial magnetic bearings researched internationally are divided into heteropolar and homopolar structures. The axial length of heteropolar structures can be made shorter, but hysteresis loss will occur, while homopolar structures The magnetic bearing hysteresis loss of the structure is greatly reduced, but the structure of ordinary magnetic bearings with the same polarity is more complex, the required radial control windings are more, the power consumption is large, and the axial space occupied is larger, which is not conducive to the improvement of the critical speed of the rotor.

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